_Hyla smaragdina_ Taylor, Copeia, No. 1:18, March 30, 1940.--6 kilometers east of Cojumatlán, Michoacán, México. _Hylella azteca_ Taylor, Proc. Biol. Soc. Washington, 56:49, June 16, 1943.--Tepoztlán, Morelos, México. Cojumatlán (30); Copuyo (7); 18 km. E of Dos Aguas (22); Ostula (8); Pómaro (3); Sahuayo; Salitre de Estopilas (7). Taylor (1940a:18) diagnosed this species as having few or no vomerine teeth, no vocal sac, a rather broad and flat head, two large tubercles below the anus, a granular venter, and a green dorsum in life. The specimens on which the description was based are either immature or non-breeding individuals; all were collected from bromeliads growing on cacti near Cojumatlán. Another small, flat-headed hylid from Tepoztlán, Morelos, was described and diagnosed by Taylor (1943b:49) as differing from _Hyla smaragdina_ in having a vocal sac and a broader head. This specimen was named _Hylella azteca_. Specimens from the coastal region of Michoacán and Colima were referred to _Hylella azteca_ by Peters (1954:7) and Duellman (1958c:8). Comparison of topotypic _Hyla smaragdina_ and the holotype of _Hylella azteca_ (UIMNH 25044) with the several series of specimens from Michoacán has resulted in the conclusion that all pertain to only one species. Although the type series of _Hyla smaragdina_ consists of immature specimens, the males in that series do possess vocal sacs. Since these were not breeding individuals, the sacs are not well developed. The characters of the anal tubercles and the relative width of the head are of no value in separating the two species. The apparently aestivating individuals comprising the type series of _Hyla smaragdina_, and the type of _Hylella azteca_, which also was found in a bromeliad, were green in life. Of the calling males found on the coast of Michoacán, most were yellowish tan when found; two were pale green, but soon changed to pale tan. Calling males from Copuyo and Dos Aguas were pale yellowish tan. Therefore the color of the dorsum is of little significance in distinguishing the two named populations. Males of _Hyla smaragdina_ have been found calling in the months of June and July from rocky streams; the call is a nasal "haah-haah-haah," repeated quickly and constantly for as long as 30 seconds. As pointed out by Duellman (1958c:9), this breeding behavior is unlike that suggested by Taylor (1943b:51). In Michoacán _Hyla smaragdina_ has been found in tropical semi-deciduous forest, oak forest, and mesquite-grassland at elevations from 150 to 1500 meters. ~Hyla smithi~ Boulenger _Hyla smithi_ Boulenger, Zool. Rec. Reptilia and Batrachia, 38:33, 1902.--Cuernavaca, Morelos, México. Aguililla (14); Apatzingán (104); Arteaga; Charapendo (5); Coalcomán (11); El Sabino (44); La Playa (6); Lombardia (2); Nueva Italia (8); Playa Azul; Salitre de Estopilas (2).